A Case Study in NASA-DoD - The Black Vault

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Table C-3
C&DH CHANGES REQUIRED TO RUN STP MISSIONS ON THE M!S
Changes to MOS for
14S Equipment STP Compatibility STPSS Equipment
Diplexer
Payload modulef
Payload modulea
Replaceb
Antenna
Hybrid
Diplexer
Receiver
Transponder
ITransmitter
I Payload modulea Switch
PSK demodulator Replace c d Dual signal conditioner
Add (if necessary) Decryption unit
Central command decoder Modify or replace Command decoder
(software change)
Premodulation processor Replace& h Dual baseband unit
Add (if necessary) Encryption unit
Tape recorder Usablei Tape recorder
Data bus controllere
I
Clock and format generatorS Usable j Bus controller (data
formatter)
Standard computer interfacef
Computer Usablek Computer
Remote unit UsableL Data interface unit
Harness and connectors Usable with proper Harness
designm
Signal conditioning and Unique and necessary1n
control unit
to HIS vehicle
aThe antenna or antennas and their components are. considered payload-unique
on the HS. The requirement for hybrids and switches would depend on the exact
placement and design of the HMS antenna system. It can be assumed that for
Space Test Program missions that the STPSS antenna can be used on the HHS.
bBecause of differences in uplink frequencies, the STDN transponder cannot
be used for SGLS. Reference I shows a receiver and transmitter rather than an
integrated transponder; however, these could be combined into an SGLS transponder.
cThe modulation differences necessitate replacing the PSK demodulator with
an SGLS signal conditioner, which includes an FSK demodulator.
dSTPSS system requirements do not include a secure uplink. However, if a
secure uplink is to be considered, it is then necessary to add a decrypter